Copper(II) Nitrate Ammoniates Cu(NH3)4(NO3)2
and Cu(NH3)2(NO3)2 and Their Thermolysis
under Reduced Pressure

S. S. Dyukarev†, I. V. Morozov, L. N. Reshetova, O. V. Guz’,
I. V. Arkhangel’skii, Yu. M. Korenev, and F. M. Spiridonov

Moscow State University, Vorob’evy gory, Moscow, 119899 Russia

Received January 5, 1998

Abstract—The compound Cu(NH3)2(NO3)2 (I) was prepared by heating Cu(NH3)4(NO3)2 (II) at atmospheric
pressure in a desiccator over H2SO4 (135°C, 72 h, dry air). Thermolysis of compounds I and II was studied by
means of gas-phase mass spectrometry at pressures from 10frame04 to 105 Pa at low heating rates. It was shown that
throughout the range of temperatures studied thermolysis of compound II results in compound I. As pressure
increases from 10frame14 to 105 Pa, the temperature at which compound II decomposes noticeably to compound I
and NH3 increases from 80–90 to 130–140°C. Thermolysis of compound I is observed at 170–180°C and
results in various products depending on the ambient pressure. The products of thermolysis at atmospheric pres-
sure are CuO; NH4NO3; NH3; HNO3; and gaseous oxidation and reduction products, mainly H2O and N2O. At
reduced pressure of 1 to 10 Pa, Cu(NO3)2 molecules appear in the gas phase in addition to the aforementioned
compounds. Under a high vacuum of 10frame24 Pa, Cu(NO3)2 and NH3 are the major products of decomposition of
compound I.

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